ended up buying a davis 7911 anemometer. it is basically the same as the 6410 that comes w/ their vp2 station, but cheaper. i found it for $89 shipped. it comes w/ a rj11 (4 wire) connector. to hook it to a digital bike speedometer, i needed to get to the 2 wires from the anemometer. i didn't want to cut the connector off in case i ever need it, so i got a phone jack coupler and a 4 conductor phone cord. cut one end off the phone cord and stripped back the wires. the anemometer uses the 2 outside wires, yellow and black, and i connected these to the 2 leads of the bike speedo (also cut from its own sensor). plug the davis into one side of the coupler and the new speedo cable into the other side, and it worked fine.
took it in the truck to try to calibrate it w/...you just change the diameter of the 'bike tire' in the speedo setup. i think i have it close, but will probably take it to work and try to match it up w/ the vp2 that they have. should be a little more accurate that way.
i am going to try to split this output when Dan gets his wind software ready for me. i would like to send the anemometer output to the computer to work w/ Dan's software, but would also like the reading on the speedo at the tower. not sure if it will work right, altho i don't see why it wouldn't.